import java.util.Scanner;

public class No378 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long x = 0;
		
		while(N != 0) {
			if(N % 2 == 1) {
				x++;
			}
			N /= 2;
		}
		
		System.out.println(x);
	}
}